Head to Head
| Europe Friendlies | 2019/08/03 09:30 | Real Sociedad B v Real Unión | L | 1-0 |
| Spain Segunda B Group 2 | 2019/02/24 17:00 | Real Sociedad B v Real Unión | L | 2-1 |
| Spain Segunda B Group 2 | 2018/10/07 15:00 | Real Unión v Real Sociedad B | W | 2-1 |
| Europe Friendlies | 2018/08/18 09:33 | Real Unión v Real Sociedad B | L | 0-3 |
| Spain Segunda B Group 2 | 2018/03/29 10:00 | Real Unión v Real Sociedad B | D | 0-0 |
| Spain Segunda B Group 2 | 2017/11/04 15:00 | Real Sociedad B v Real Unión | L | 2-0 |
| Europe Friendlies | 2017/08/09 16:57 | Real Sociedad B v Real Unión | L | 2-0 |
| Spain Segunda B Group 2 | 2017/01/21 18:00 | Real Unión v Real Sociedad B | D | 2-2 |
Home History
| Spain Segunda B Group 2 | 2019/12/08 16:00 | Barakaldo v Real Unión | L | 2-1 |
| Spain Segunda B Group 2 | 2019/12/01 16:00 | Real Unión v Leioa | D | 0-0 |
| Spain Segunda B Group 2 | 2019/11/24 15:00 | Izarra v Real Unión | W | 0-1 |
| Spain Segunda B Group 2 | 2019/11/17 17:00 | Real Unión v Guijuelo | W | 2-1 |
| Spain Segunda B Group 2 | 2019/11/09 15:00 | Unionistas de Salamanca CF v Real Unión | W | 0-2 |
| Spain Segunda B Group 2 | 2019/11/03 16:00 | Real Unión v Burgos | L | 0-1 |
| Spain Segunda B Group 2 | 2019/10/26 17:00 | UD Logrones v Real Unión | L | 3-2 |
| Spain Segunda B Group 2 | 2019/10/19 14:00 | Real Unión v Athletic Bilbao B | L | 0-1 |
Away History
| Spain Segunda B Group 2 | 2019/12/07 15:00 | Real Sociedad B v Amorebieta | W | 4-2 |
| Spain Segunda B Group 2 | 2019/11/30 17:00 | Arenas Club de Getxo v Real Sociedad B | L | 1-0 |
| Spain Segunda B Group 2 | 2019/11/23 17:00 | Real Sociedad B v Osasuna B | W | 3-1 |
| Spain Segunda B Group 2 | 2019/11/17 11:00 | Tudelano v Real Sociedad B | D | 0-0 |
| Spain Segunda B Group 2 | 2019/11/09 17:00 | Real Sociedad B v Salamanca CF UDS | W | 3-1 |
| Spain Segunda B Group 2 | 2019/11/03 17:00 | Cultural Leonesa v Real Sociedad B | L | 3-0 |
| Spain Segunda B Group 2 | 2019/10/26 16:30 | Real Sociedad B v CD Calahorra | W | 2-0 |
| Spain Segunda B Group 2 | 2019/10/20 15:00 | Haro Deportivo v Real Sociedad B | L | 2-0 |